This number belongs to Abilene Diagnostic Clinic if you have a Doctor in the clinic and their offices return your call it will come up on your caller I.D. as 325-698-1048 no matter which doctor called you. I called the number back and got the explaination. Hope this helps!!
Due to HIPAA/patient privacy laws I am sure they cannot leave a message (that is why they don't say who is calling). The calls are usually a reminder of a pre-scheduled appointment.